If you are from a country outside the EU/EEA, and you are already holding a residence permit for the purpose of attending a course at a folk high school, you can apply for an extension of your residence permit up to a maximum stay of 18 months. The 18 months can be spent on courses at different folk high schools, either as one course of 18 consecutive months, or as more separate courses.
The application for extension of the residence permit can be forwarded during a legal stay in Denmark, but it must be forwarded 2 months before the existing residence permit expires. Otherwise you will have to return to your home country and start over the process.
In order to maintain the residence permit it is a condition that you follow the educational programme of the school actively. If this is not the case, the Danish Agency for Labour Retention and International Recruitment can revoke your residence permit. The school is obliged to inform the Danish Agency for Labour Retention and International Recruitment if you are not actively participating in the school's activities.